Notwithstanding the arguments of Spinosa, and Des Cartes, and other advocates of the _Material system_, or, in more appropriate language, the _Atheistical system_! it is admitted by all men, not prejudiced, not biased by sceptical prepossessions, that _mind_ is distinct from _matter_. The mind of man, however, is involved in inscrutable darkness, (as the profoundest metaphysicians well know) and is to be estimated, if at all, alone by an inductive process; that is, by its _effects_. Without entering on the question, whether an extremely circumscribed portion of the mental process, surpassing instinct, may or may not be extended to quadrupeds, it is universally acknowledged, that the mind of man alone, regulates all the actions[10] of his corporeal frame. Mind, therefore, may be regarded as a distinct genus, in the scale ascending above brutes, and including the whole of intellectual existences; advancing from _thought_, that mysterious thing! in its lowest form, through all the gradations of sentient and rational beings, till it arrives at a Bacon, a Newton; and then, when unincumbered by matter, extending its illimitable sway through Seraph and Archangel, till we are lost in the GREAT INFINITE!

Is it not deserving of notice, as an especial subject of meditation, that our _limbs_, in all they do or can accomplish, implicitly obey the dictation of the _mind_? that this operating power, whatever its name, under certain limitations, exercises a sovereign dominion not only over our limbs, but over our[11] intellectual pursuits? The mind of every man is evidently the fulcrum, the moving force, which alike regulates all his limbs and actions: and in which example, we find a strong illustration of the subordinate nature of mere _matter_. That alone which gives direction to the organic parts of our nature, is wholly _mind_; and one mind if placed over a thousand limbs, could, with undiminished ease, control and regulate the whole.

Biographia Epistolaris Volume 2 — Part 13

This idea is advanced on the supposition that _one mind_ could command an unlimited direction over any given number of _limbs_, provided they were all connected by _joint_ and _sinew_. But suppose, through some occult and inconceivable means, these limbs were dis-associated, as to all material connexion; suppose, for instance, one mind with unlimited authority, governed the operations of _two_ separate persons, would not this substantially, be only _one person_, seeing the directing principle was one? If the truth here contended for, be admitted, that _two persons_, governed by _one mind_, is incontestably _one person_; the same conclusion would be arrived at, and the proposition equally be justified, which affirmed that, _three_, or otherwise _four_ persons, owning also necessary and essential subjection to _one mind_, would only be so many diversities or modifications of that _one mind_, and therefore the component parts virtually collapsing into _one whole_, the person would be _one_. Let any man ask himself, whose understanding can both reason and become the depository of truth, whether, if _one mind_ thus regulated with absolute authority, _three_, or otherwise _four_ persons, with all their congeries of material parts, would not these parts inert in themselves, when subjected to one predominant mind, be in the most logical sense, _one person_? Are ligament and exterior combination indispensable pre-requisites to the sovereign influence of mind over mind? or mind over matter?

Biographia Epistolaris Volume 2 — Part 13